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Glutamine metabolism and optimal immune and CNS function
Journal article   Open access   Peer reviewed

Glutamine metabolism and optimal immune and CNS function

Philip Newsholme, Garron Thomas Dodd, Vinicius Leonardo Sousa Diniz and Vinicius Cruzat
Proceedings of the Nutrition Society, Vol.82(1), pp.22-31
02/2023
PMID: 36285520
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Abstract

Immune cells Intermediary metabolism Amino acids Central nervous system
Nutrients can impact and regulate cellular metabolism and cell function which is particularly important for the activation and function of diverse immune subsets. Among the critical nutrients for immune cell function and fate, glutamine is possibly the most widely recognised immunonutrient, playing key roles in TCA cycle, heat shock protein responses and antioxidant systems. In addition, glutamine is also involved with inter-organ ammonia transport, and this is particularly important for not only immune cells, but also to the brain, especially in catabolic situations such as critical care and extenuating exercise. The well characterised fall in blood glutamine availability has been the main reason for studies to investigate the possible effects of glutamine replacement via supplementation but many of the results are in poor agreement. At the same time, a range of complex pathways involved in glutamine metabolism have been revealed via supplementation studies. This article will briefly review the function of glutamine in the immune system, with emphasis on metabolic mechanisms, and the emerging role of glutamine in the brain glutamate/gamma-amino buty-ric acid cycle. In addition, relevant aspects of glutamine supplementation are discussed.

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